G2A sounds like one of those sleazy companies that knows people are using their product to perform fraudulent sales, earns profits from those fraudulent sales, even encourages them, and then tries to hide behind the "common carrier" defense, ala Megaupload. There's a complex argument in these situations about principles of freedom, who's to blame, whether technology or laws and regulations should be used to solve the problem, etc. At the end of the day, we all know that they're sleazy, though, just like Kim Dotcom. There's no moral defense, only legal tactics. Patronizing sites like this makes you part of the problem, unless and until they start eating the fraud costs themselves or otherwise make an honest effort to prevent it. Things like the Steam code friend-account bot show how instead they intentionally commit the fraud.

That said, I also think the regional pricing needs to go. If publishers want to charge me more so they can subsidize cheap sales in another market, they're free to do that, but they don't get my sympathy when that backfires on them. G2A is still sleazy for facilitating it, but the publishers created that problem themselves.